2. 外语
  3. Slight but________variations in the timing of the star’s light pulses led astronomers to deduce that it was being pulled backwar

Slight but________variations in the timing of the star’s light pulses led astronomers to deduce that it was being pulled backwar

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问题 Slight but________variations in the timing of the star’s light pulses led astronomers to deduce that it was being pulled backward and forward by three planets orbiting around it.
选项 A、subtle
B、regular
C、explicable
D、undetectable
E、inconsequential
答案B
解析 逻辑连接词是lead…to，表示因果关系，前后同义对应。前面说恒星slight but________的时间差异，后面说这让天文学家推断这是pulled backward and forward by three planets的结果，两部分同义对应。因此空格表达天体被引力pullback ward and forward运动的特点，这种运动应该是有规律的，B项regular(规律的)最符合这层含义。有同学会错选C，注意既然是explicable(可解释的)，那么为何天文学家还需要去推断(led astronomers to deduce)呢?显然前后矛盾。
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